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Negative refraction in anisotropic waveguides made from quantum metamaterials

机译:量子超材料制成的各向异性波导中的负折射

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摘要

We describe two metamaterial waveguide designs which display negative refraction. Both use quantum well nanostructures to engineer tunable resonances in the dielectric response, which can be designed using the rules of quantum mechanics. One uses coupling to a "plasmonic" resonance in adjacent metallic layers to enhance the size of the negative refraction effect. The negative refraction appears close to the quantum well intersub-band transition energy, and is sensitive to the two-dimensional concentration of electrons within the wells and in adjacent conducting layers, thus offering the potential for switchable devices. These "quantum metamaterials" are highly distributed multilayered optically anisotropic systems with comparatively low absorption in the negatively refracting spectral region, and they can readily be grown by conventional semiconductor epitaxial growth technologies.
机译:我们描述了两种显示负折射的超材料波导设计。两者都使用量子阱纳米结构来设计介电响应中的可调谐共振,可以使用量子力学规则进行设计。人们使用耦合到相邻金属层中的“等离子体”共振来增强负折射效应的大小。负折射出现在量子阱子带间跃迁能量附近,并且对阱内和相邻导电层中电子的二维浓度敏感,因此为可开关器件提供了潜力。这些“量子超材料”是高度分散的多层光学各向异性系统,在负折射光谱区域具有较低的吸收率,可以通过常规的半导体外延生长技术轻松地进行生长。

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